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        <a href="../.." >ArrayBuffer 对象，Blob对象</a>
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                                <h1 id="arraybuffer-&#x5BF9;&#x8C61;&#xFF0C;blob-&#x5BF9;&#x8C61;">ArrayBuffer &#x5BF9;&#x8C61;&#xFF0C;Blob &#x5BF9;&#x8C61;</h1>
<h2 id="arraybuffer-&#x5BF9;&#x8C61;">ArrayBuffer &#x5BF9;&#x8C61;</h2>
<p>ArrayBuffer &#x5BF9;&#x8C61;&#x8868;&#x793A;&#x4E00;&#x6BB5;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#xFF0C;&#x7528;&#x6765;&#x6A21;&#x62DF;&#x5185;&#x5B58;&#x91CC;&#x9762;&#x7684;&#x6570;&#x636E;&#x3002;&#x901A;&#x8FC7;&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;JavaScript &#x53EF;&#x4EE5;&#x8BFB;&#x5199;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#x3002;&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#x53EF;&#x4EE5;&#x770B;&#x4F5C;&#x5185;&#x5B58;&#x6570;&#x636E;&#x7684;&#x8868;&#x8FBE;&#x3002;</p>
<p>&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#x662F; ES6 &#x624D;&#x5199;&#x5165;&#x6807;&#x51C6;&#x7684;&#xFF0C;&#x666E;&#x901A;&#x7684;&#x7F51;&#x9875;&#x7F16;&#x7A0B;&#x7528;&#x4E0D;&#x5230;&#x5B83;&#xFF0C;&#x4E3A;&#x4E86;&#x6559;&#x7A0B;&#x4F53;&#x7CFB;&#x7684;&#x5B8C;&#x6574;&#xFF0C;&#x4E0B;&#x9762;&#x53EA;&#x63D0;&#x4F9B;&#x4E00;&#x4E2A;&#x7B80;&#x7565;&#x7684;&#x4ECB;&#x7ECD;&#xFF0C;&#x8BE6;&#x7EC6;&#x4ECB;&#x7ECD;&#x8BF7;&#x770B;&#x300A;ES6 &#x6807;&#x51C6;&#x5165;&#x95E8;&#x300B;&#x91CC;&#x9762;&#x7684;&#x7AE0;&#x8282;&#x3002;</p>
<p>&#x6D4F;&#x89C8;&#x5668;&#x539F;&#x751F;&#x63D0;&#x4F9B;<code>ArrayBuffer()</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x7528;&#x6765;&#x751F;&#x6210;&#x5B9E;&#x4F8B;&#x3002;&#x5B83;&#x63A5;&#x53D7;&#x4E00;&#x4E2A;&#x6574;&#x6570;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#xFF0C;&#x8868;&#x793A;&#x8FD9;&#x6BB5;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#x5360;&#x7528;&#x591A;&#x5C11;&#x4E2A;&#x5B57;&#x8282;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> buffer = <span class="hljs-keyword">new</span> <span class="hljs-built_in">ArrayBuffer</span>(<span class="hljs-number">8</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;<code>buffer</code>&#x5360;&#x7528;8&#x4E2A;&#x5B57;&#x8282;&#x3002;</p>
<p>ArrayBuffer &#x5BF9;&#x8C61;&#x6709;&#x5B9E;&#x4F8B;&#x5C5E;&#x6027;<code>byteLength</code>&#xFF0C;&#x8868;&#x793A;&#x5F53;&#x524D;&#x5B9E;&#x4F8B;&#x5360;&#x7528;&#x7684;&#x5185;&#x5B58;&#x957F;&#x5EA6;&#xFF08;&#x5355;&#x4F4D;&#x5B57;&#x8282;&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> buffer = <span class="hljs-keyword">new</span> <span class="hljs-built_in">ArrayBuffer</span>(<span class="hljs-number">8</span>);
buffer.byteLength <span class="hljs-comment">// 8</span>
</code></pre>
<p>ArrayBuffer &#x5BF9;&#x8C61;&#x6709;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;<code>slice()</code>&#xFF0C;&#x7528;&#x6765;&#x590D;&#x5236;&#x4E00;&#x90E8;&#x5206;&#x5185;&#x5B58;&#x3002;&#x5B83;&#x63A5;&#x53D7;&#x4E24;&#x4E2A;&#x6574;&#x6570;&#x53C2;&#x6570;&#xFF0C;&#x5206;&#x522B;&#x8868;&#x793A;&#x590D;&#x5236;&#x7684;&#x5F00;&#x59CB;&#x4F4D;&#x7F6E;&#xFF08;&#x4ECE;0&#x5F00;&#x59CB;&#xFF09;&#x548C;&#x7ED3;&#x675F;&#x4F4D;&#x7F6E;&#xFF08;&#x590D;&#x5236;&#x65F6;&#x4E0D;&#x5305;&#x62EC;&#x7ED3;&#x675F;&#x4F4D;&#x7F6E;&#xFF09;&#xFF0C;&#x5982;&#x679C;&#x7701;&#x7565;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x5219;&#x8868;&#x793A;&#x4E00;&#x76F4;&#x590D;&#x5236;&#x5230;&#x7ED3;&#x675F;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> buf1 = <span class="hljs-keyword">new</span> <span class="hljs-built_in">ArrayBuffer</span>(<span class="hljs-number">8</span>);
<span class="hljs-keyword">var</span> buf2 = buf1.slice(<span class="hljs-number">0</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8868;&#x793A;&#x590D;&#x5236;&#x539F;&#x6765;&#x7684;&#x5B9E;&#x4F8B;&#x3002;</p>
<h2 id="blob-&#x5BF9;&#x8C61;">Blob &#x5BF9;&#x8C61;</h2>
<h3 id="&#x7B80;&#x4ECB;">&#x7B80;&#x4ECB;</h3>
<p>Blob &#x5BF9;&#x8C61;&#x8868;&#x793A;&#x4E00;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x6587;&#x4EF6;&#x7684;&#x6570;&#x636E;&#x5185;&#x5BB9;&#xFF0C;&#x6BD4;&#x5982;&#x4E00;&#x4E2A;&#x56FE;&#x7247;&#x6587;&#x4EF6;&#x7684;&#x5185;&#x5BB9;&#x5C31;&#x53EF;&#x4EE5;&#x901A;&#x8FC7; Blob &#x5BF9;&#x8C61;&#x8BFB;&#x5199;&#x3002;&#x5B83;&#x901A;&#x5E38;&#x7528;&#x6765;&#x8BFB;&#x5199;&#x6587;&#x4EF6;&#xFF0C;&#x5B83;&#x7684;&#x540D;&#x5B57;&#x662F; Binary Large Object &#xFF08;&#x4E8C;&#x8FDB;&#x5236;&#x5927;&#x578B;&#x5BF9;&#x8C61;&#xFF09;&#x7684;&#x7F29;&#x5199;&#x3002;&#x5B83;&#x4E0E; ArrayBuffer &#x7684;&#x533A;&#x522B;&#x5728;&#x4E8E;&#xFF0C;&#x5B83;&#x7528;&#x4E8E;&#x64CD;&#x4F5C;&#x4E8C;&#x8FDB;&#x5236;&#x6587;&#x4EF6;&#xFF0C;&#x800C; ArrayBuffer &#x7528;&#x4E8E;&#x64CD;&#x4F5C;&#x5185;&#x5B58;&#x3002;</p>
<p>&#x6D4F;&#x89C8;&#x5668;&#x539F;&#x751F;&#x63D0;&#x4F9B;<code>Blob()</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x7528;&#x6765;&#x751F;&#x6210;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">new</span> Blob(array [, options])
</code></pre>
<p><code>Blob</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x63A5;&#x53D7;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#x3002;&#x7B2C;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x662F;&#x6570;&#x7EC4;&#xFF0C;&#x6210;&#x5458;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#x6216;&#x4E8C;&#x8FDB;&#x5236;&#x5BF9;&#x8C61;&#xFF0C;&#x8868;&#x793A;&#x65B0;&#x751F;&#x6210;&#x7684;<code>Blob</code>&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x7684;&#x5185;&#x5BB9;&#xFF1B;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x662F;&#x53EF;&#x9009;&#x7684;&#xFF0C;&#x662F;&#x4E00;&#x4E2A;&#x914D;&#x7F6E;&#x5BF9;&#x8C61;&#xFF0C;&#x76EE;&#x524D;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x5C5E;&#x6027;<code>type</code>&#xFF0C;&#x5B83;&#x7684;&#x503C;&#x662F;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x8868;&#x793A;&#x6570;&#x636E;&#x7684; MIME &#x7C7B;&#x578B;&#xFF0C;&#x9ED8;&#x8BA4;&#x662F;&#x7A7A;&#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> htmlFragment = [<span class="hljs-string">&apos;&lt;a id=&quot;a&quot;&gt;&lt;b id=&quot;b&quot;&gt;hey!&lt;/b&gt;&lt;/a&gt;&apos;</span>];
<span class="hljs-keyword">var</span> myBlob = <span class="hljs-keyword">new</span> Blob(htmlFragment, {type : <span class="hljs-string">&apos;text/html&apos;</span>});
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;<code>myBlob</code>&#x5305;&#x542B;&#x7684;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#x3002;&#x751F;&#x6210;&#x5B9E;&#x4F8B;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x6307;&#x5B9A;&#x4E3A;<code>text/html</code>&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x662F;&#x53E6;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#xFF0C;Blob &#x4FDD;&#x5B58; JSON &#x6570;&#x636E;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = { hello: <span class="hljs-string">&apos;world&apos;</span> };
<span class="hljs-keyword">var</span> blob = <span class="hljs-keyword">new</span> Blob([ <span class="hljs-built_in">JSON</span>.stringify(obj) ], {type : <span class="hljs-string">&apos;application/json&apos;</span>});
</code></pre>
<h3 id="&#x5B9E;&#x4F8B;&#x5C5E;&#x6027;&#x548C;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;">&#x5B9E;&#x4F8B;&#x5C5E;&#x6027;&#x548C;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;</h3>
<p><code>Blob</code>&#x5177;&#x6709;&#x4E24;&#x4E2A;&#x5B9E;&#x4F8B;&#x5C5E;&#x6027;<code>size</code>&#x548C;<code>type</code>&#xFF0C;&#x5206;&#x522B;&#x8FD4;&#x56DE;&#x6570;&#x636E;&#x7684;&#x5927;&#x5C0F;&#x548C;&#x7C7B;&#x578B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> htmlFragment = [<span class="hljs-string">&apos;&lt;a id=&quot;a&quot;&gt;&lt;b id=&quot;b&quot;&gt;hey!&lt;/b&gt;&lt;/a&gt;&apos;</span>];
<span class="hljs-keyword">var</span> myBlob = <span class="hljs-keyword">new</span> Blob(htmlFragment, {type : <span class="hljs-string">&apos;text/html&apos;</span>});

myBlob.size <span class="hljs-comment">// 32</span>
myBlob.type <span class="hljs-comment">// &quot;text/html&quot;</span>
</code></pre>
<p><code>Blob</code>&#x5177;&#x6709;&#x4E00;&#x4E2A;&#x5B9E;&#x4F8B;&#x65B9;&#x6CD5;<code>slice</code>&#xFF0C;&#x7528;&#x6765;&#x62F7;&#x8D1D;&#x539F;&#x6765;&#x7684;&#x6570;&#x636E;&#xFF0C;&#x8FD4;&#x56DE;&#x7684;&#x4E5F;&#x662F;&#x4E00;&#x4E2A;<code>Blob</code>&#x5B9E;&#x4F8B;&#x3002;</p>
<pre><code class="lang-javascript">myBlob.slice(start&#xFF0C;end, contentType)
</code></pre>
<p><code>slice</code>&#x65B9;&#x6CD5;&#x6709;&#x4E09;&#x4E2A;&#x53C2;&#x6570;&#xFF0C;&#x90FD;&#x662F;&#x53EF;&#x9009;&#x7684;&#x3002;&#x5B83;&#x4EEC;&#x4F9D;&#x6B21;&#x662F;&#x8D77;&#x59CB;&#x7684;&#x5B57;&#x8282;&#x4F4D;&#x7F6E;&#xFF08;&#x9ED8;&#x8BA4;&#x4E3A;0&#xFF09;&#x3001;&#x7ED3;&#x675F;&#x7684;&#x5B57;&#x8282;&#x4F4D;&#x7F6E;&#xFF08;&#x9ED8;&#x8BA4;&#x4E3A;<code>size</code>&#x5C5E;&#x6027;&#x7684;&#x503C;&#xFF0C;&#x8BE5;&#x4F4D;&#x7F6E;&#x672C;&#x8EAB;&#x5C06;&#x4E0D;&#x5305;&#x542B;&#x5728;&#x62F7;&#x8D1D;&#x7684;&#x6570;&#x636E;&#x4E4B;&#x4E2D;&#xFF09;&#x3001;&#x65B0;&#x5B9E;&#x4F8B;&#x7684;&#x6570;&#x636E;&#x7C7B;&#x578B;&#xFF08;&#x9ED8;&#x8BA4;&#x4E3A;&#x7A7A;&#x5B57;&#x7B26;&#x4E32;&#xFF09;&#x3002;</p>
<h3 id="&#x83B7;&#x53D6;&#x6587;&#x4EF6;&#x4FE1;&#x606F;">&#x83B7;&#x53D6;&#x6587;&#x4EF6;&#x4FE1;&#x606F;</h3>
<p>&#x6587;&#x4EF6;&#x9009;&#x62E9;&#x5668;<code>&lt;input type=&quot;file&quot;&gt;</code>&#x7528;&#x6765;&#x8BA9;&#x7528;&#x6237;&#x9009;&#x53D6;&#x6587;&#x4EF6;&#x3002;&#x51FA;&#x4E8E;&#x5B89;&#x5168;&#x8003;&#x8651;&#xFF0C;&#x6D4F;&#x89C8;&#x5668;&#x4E0D;&#x5141;&#x8BB8;&#x811A;&#x672C;&#x81EA;&#x884C;&#x8BBE;&#x7F6E;&#x8FD9;&#x4E2A;&#x63A7;&#x4EF6;&#x7684;<code>value</code>&#x5C5E;&#x6027;&#xFF0C;&#x5373;&#x6587;&#x4EF6;&#x5FC5;&#x987B;&#x662F;&#x7528;&#x6237;&#x624B;&#x52A8;&#x9009;&#x53D6;&#x7684;&#xFF0C;&#x4E0D;&#x80FD;&#x662F;&#x811A;&#x672C;&#x6307;&#x5B9A;&#x7684;&#x3002;&#x4E00;&#x65E6;&#x7528;&#x6237;&#x9009;&#x597D;&#x4E86;&#x6587;&#x4EF6;&#xFF0C;&#x811A;&#x672C;&#x5C31;&#x53EF;&#x4EE5;&#x8BFB;&#x53D6;&#x8FD9;&#x4E2A;&#x6587;&#x4EF6;&#x3002;</p>
<p>&#x6587;&#x4EF6;&#x9009;&#x62E9;&#x5668;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A; FileList &#x5BF9;&#x8C61;&#xFF0C;&#x8BE5;&#x5BF9;&#x8C61;&#x662F;&#x4E00;&#x4E2A;&#x7C7B;&#x4F3C;&#x6570;&#x7EC4;&#x7684;&#x6210;&#x5458;&#xFF0C;&#x6BCF;&#x4E2A;&#x6210;&#x5458;&#x90FD;&#x662F;&#x4E00;&#x4E2A; File &#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x3002;File &#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x662F;&#x4E00;&#x4E2A;&#x7279;&#x6B8A;&#x7684; Blob &#x5B9E;&#x4F8B;&#xFF0C;&#x589E;&#x52A0;&#x4E86;<code>name</code>&#x548C;<code>lastModifiedDate</code>&#x5C5E;&#x6027;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// HTML &#x4EE3;&#x7801;&#x5982;&#x4E0B;</span>
<span class="hljs-comment">// &lt;input type=&quot;file&quot; accept=&quot;image/*&quot; multiple onchange=&quot;fileinfo(this.files)&quot;/&gt;</span>

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">fileinfo</span>(<span class="hljs-params">files</span>) </span>{
  <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>; i &lt; files.length; i++) {
    <span class="hljs-keyword">var</span> f = files[i];
    <span class="hljs-built_in">console</span>.log(
      f.name, <span class="hljs-comment">// &#x6587;&#x4EF6;&#x540D;&#xFF0C;&#x4E0D;&#x542B;&#x8DEF;&#x5F84;</span>
      f.size, <span class="hljs-comment">// &#x6587;&#x4EF6;&#x5927;&#x5C0F;&#xFF0C;Blob &#x5B9E;&#x4F8B;&#x5C5E;&#x6027;</span>
      f.type, <span class="hljs-comment">// &#x6587;&#x4EF6;&#x7C7B;&#x578B;&#xFF0C;Blob &#x5B9E;&#x4F8B;&#x5C5E;&#x6027;</span>
      f.lastModifiedDate <span class="hljs-comment">// &#x6587;&#x4EF6;&#x7684;&#x6700;&#x540E;&#x4FEE;&#x6539;&#x65F6;&#x95F4;</span>
    );
  }
}
</code></pre>
<p>&#x9664;&#x4E86;&#x6587;&#x4EF6;&#x9009;&#x62E9;&#x5668;&#xFF0C;&#x62D6;&#x653E; API &#x7684;<code>dataTransfer.files</code>&#x8FD4;&#x56DE;&#x7684;&#x4E5F;&#x662F;&#x4E00;&#x4E2A;FileList &#x5BF9;&#x8C61;&#xFF0C;&#x5B83;&#x7684;&#x6210;&#x5458;&#x56E0;&#x6B64;&#x4E5F;&#x662F; File &#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x3002;</p>
<h3 id="&#x4E0B;&#x8F7D;&#x6587;&#x4EF6;">&#x4E0B;&#x8F7D;&#x6587;&#x4EF6;</h3>
<p>AJAX &#x8BF7;&#x6C42;&#x65F6;&#xFF0C;&#x5982;&#x679C;&#x6307;&#x5B9A;<code>responseType</code>&#x5C5E;&#x6027;&#x4E3A;<code>blob</code>&#xFF0C;&#x4E0B;&#x8F7D;&#x4E0B;&#x6765;&#x7684;&#x5C31;&#x662F;&#x4E00;&#x4E2A; Blob &#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getBlob</span>(<span class="hljs-params">url, callback</span>) </span>{
  <span class="hljs-keyword">var</span> xhr = <span class="hljs-keyword">new</span> XMLHttpRequest();
  xhr.open(<span class="hljs-string">&apos;GET&apos;</span>, url);
  xhr.responseType = <span class="hljs-string">&apos;blob&apos;</span>;
  xhr.onload = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    callback(xhr.response);
  }
  xhr.send(<span class="hljs-literal">null</span>);
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>xhr.response</code>&#x62FF;&#x5230;&#x7684;&#x5C31;&#x662F;&#x4E00;&#x4E2A; Blob &#x5BF9;&#x8C61;&#x3002;</p>
<h3 id="&#x751F;&#x6210;-url">&#x751F;&#x6210; URL</h3>
<p>&#x6D4F;&#x89C8;&#x5668;&#x5141;&#x8BB8;&#x4F7F;&#x7528;<code>URL.createObjectURL()</code>&#x65B9;&#x6CD5;&#xFF0C;&#x9488;&#x5BF9; Blob &#x5BF9;&#x8C61;&#x751F;&#x6210;&#x4E00;&#x4E2A;&#x4E34;&#x65F6; URL&#xFF0C;&#x4EE5;&#x4FBF;&#x4E8E;&#x67D0;&#x4E9B; API &#x4F7F;&#x7528;&#x3002;&#x8FD9;&#x4E2A; URL &#x4EE5;<code>blob://</code>&#x5F00;&#x5934;&#xFF0C;&#x8868;&#x660E;&#x5BF9;&#x5E94;&#x4E00;&#x4E2A; Blob &#x5BF9;&#x8C61;&#xFF0C;&#x534F;&#x8BAE;&#x5934;&#x540E;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x8BC6;&#x522B;&#x7B26;&#xFF0C;&#x7528;&#x6765;&#x552F;&#x4E00;&#x5BF9;&#x5E94;&#x5185;&#x5B58;&#x91CC;&#x9762;&#x7684; Blob &#x5BF9;&#x8C61;&#x3002;&#x8FD9;&#x4E00;&#x70B9;&#x4E0E;<code>data://URL</code>&#xFF08;URL &#x5305;&#x542B;&#x5B9E;&#x9645;&#x6570;&#x636E;&#xFF09;&#x548C;<code>file://URL</code>&#xFF08;&#x672C;&#x5730;&#x6587;&#x4EF6;&#x7CFB;&#x7EDF;&#x91CC;&#x9762;&#x7684;&#x6587;&#x4EF6;&#xFF09;&#x90FD;&#x4E0D;&#x4E00;&#x6837;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> droptarget = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;droptarget&apos;</span>);

droptarget.ondrop = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
  <span class="hljs-keyword">var</span> files = e.dataTransfer.files;
  <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>; i &lt; files.length; i++) {
    <span class="hljs-keyword">var</span> type = files[i].type;
    <span class="hljs-keyword">if</span> (type.substring(<span class="hljs-number">0</span>,<span class="hljs-number">6</span>) !== <span class="hljs-string">&apos;image/&apos;</span>)
      <span class="hljs-keyword">continue</span>;
    <span class="hljs-keyword">var</span> img = <span class="hljs-built_in">document</span>.createElement(<span class="hljs-string">&apos;img&apos;</span>);
    img.src = URL.createObjectURL(files[i]);
    img.onload = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
      <span class="hljs-keyword">this</span>.width = <span class="hljs-number">100</span>;
      <span class="hljs-built_in">document</span>.body.appendChild(<span class="hljs-keyword">this</span>);
      URL.revokeObjectURL(<span class="hljs-keyword">this</span>.src);
    }
  }
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x901A;&#x8FC7;&#x4E3A;&#x62D6;&#x653E;&#x7684;&#x56FE;&#x7247;&#x6587;&#x4EF6;&#x751F;&#x6210;&#x4E00;&#x4E2A; URL&#xFF0C;&#x4EA7;&#x751F;&#x5B83;&#x4EEC;&#x7684;&#x7F29;&#x7565;&#x56FE;&#xFF0C;&#x4ECE;&#x800C;&#x4F7F;&#x5F97;&#x7528;&#x6237;&#x53EF;&#x4EE5;&#x9884;&#x89C8;&#x9009;&#x62E9;&#x7684;&#x6587;&#x4EF6;&#x3002;</p>
<p>&#x6D4F;&#x89C8;&#x5668;&#x5904;&#x7406; Blob URL &#x5C31;&#x8DDF;&#x666E;&#x901A;&#x7684; URL &#x4E00;&#x6837;&#xFF0C;&#x5982;&#x679C; Blob &#x5BF9;&#x8C61;&#x4E0D;&#x5B58;&#x5728;&#xFF0C;&#x8FD4;&#x56DE;404&#x72B6;&#x6001;&#x7801;&#xFF1B;&#x5982;&#x679C;&#x8DE8;&#x57DF;&#x8BF7;&#x6C42;&#xFF0C;&#x8FD4;&#x56DE;403&#x72B6;&#x6001;&#x7801;&#x3002;Blob URL &#x53EA;&#x5BF9; GET &#x8BF7;&#x6C42;&#x6709;&#x6548;&#xFF0C;&#x5982;&#x679C;&#x8BF7;&#x6C42;&#x6210;&#x529F;&#xFF0C;&#x8FD4;&#x56DE;200&#x72B6;&#x6001;&#x7801;&#x3002;&#x7531;&#x4E8E; Blob URL &#x5C31;&#x662F;&#x666E;&#x901A; URL&#xFF0C;&#x56E0;&#x6B64;&#x53EF;&#x4EE5;&#x4E0B;&#x8F7D;&#x3002;</p>
<h3 id="&#x8BFB;&#x53D6;&#x6587;&#x4EF6;">&#x8BFB;&#x53D6;&#x6587;&#x4EF6;</h3>
<p>&#x53D6;&#x5F97; Blob &#x5BF9;&#x8C61;&#x4EE5;&#x540E;&#xFF0C;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;<code>FileReader</code>&#x5BF9;&#x8C61;&#xFF0C;&#x8BFB;&#x53D6; Blob &#x5BF9;&#x8C61;&#x7684;&#x5185;&#x5BB9;&#xFF0C;&#x5373;&#x6587;&#x4EF6;&#x5185;&#x5BB9;&#x3002;</p>
<p>FileReader &#x5BF9;&#x8C61;&#x63D0;&#x4F9B;&#x56DB;&#x4E2A;&#x65B9;&#x6CD5;&#xFF0C;&#x5904;&#x7406; Blob &#x5BF9;&#x8C61;&#x3002;Blob &#x5BF9;&#x8C61;&#x4F5C;&#x4E3A;&#x53C2;&#x6570;&#x4F20;&#x5165;&#x8FD9;&#x4E9B;&#x65B9;&#x6CD5;&#xFF0C;&#x7136;&#x540E;&#x4EE5;&#x6307;&#x5B9A;&#x7684;&#x683C;&#x5F0F;&#x8FD4;&#x56DE;&#x3002;</p>
<ul>
<li><code>FileReader.readAsText()</code>&#xFF1A;&#x8FD4;&#x56DE;&#x6587;&#x672C;&#xFF0C;&#x9700;&#x8981;&#x6307;&#x5B9A;&#x6587;&#x672C;&#x7F16;&#x7801;&#xFF0C;&#x9ED8;&#x8BA4;&#x4E3A; UTF-8&#x3002;</li>
<li><code>FileReader.readAsArrayBuffer()</code>&#xFF1A;&#x8FD4;&#x56DE; ArrayBuffer &#x5BF9;&#x8C61;&#x3002;</li>
<li><code>FileReader.readAsDataURL()</code>&#xFF1A;&#x8FD4;&#x56DE; Data URL&#x3002;</li>
<li><code>FileReader.readAsBinaryString()</code>&#xFF1A;&#x8FD4;&#x56DE;&#x539F;&#x59CB;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x5B57;&#x7B26;&#x4E32;&#x3002;</li>
</ul>
<p>&#x4E0B;&#x9762;&#x662F;<code>FileReader.readAsText()</code>&#x65B9;&#x6CD5;&#x7684;&#x4F8B;&#x5B50;&#xFF0C;&#x7528;&#x6765;&#x8BFB;&#x53D6;&#x6587;&#x672C;&#x6587;&#x4EF6;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// HTML &#x4EE3;&#x7801;&#x5982;&#x4E0B;</span>
<span class="hljs-comment">// &lt;input type=&#x2019;file&apos; onchange=&apos;readfile(this.files[0])&apos;&gt;&lt;/input&gt;</span>
<span class="hljs-comment">// &lt;pre id=&apos;output&apos;&gt;&lt;/pre&gt;</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">readfile</span>(<span class="hljs-params">f</span>) </span>{
  <span class="hljs-keyword">var</span> reader = <span class="hljs-keyword">new</span> FileReader();
  reader.readAsText(f);
  reader.onload = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    <span class="hljs-keyword">var</span> text = reader.result;
    <span class="hljs-keyword">var</span> out = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;output&apos;</span>);
    out.innerHTML = <span class="hljs-string">&apos;&apos;</span>;
    out.appendChild(<span class="hljs-built_in">document</span>.createTextNode(text));
  }
  reader.onerror = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">e</span>) </span>{
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;Error&apos;</span>, e);
  };
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x901A;&#x8FC7;&#x6307;&#x5B9A; FileReader &#x5B9E;&#x4F8B;&#x5BF9;&#x8C61;&#x7684;<code>onload</code>&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x5728;&#x5B9E;&#x4F8B;&#x7684;<code>result</code>&#x5C5E;&#x6027;&#x4E0A;&#x62FF;&#x5230;&#x6587;&#x4EF6;&#x5185;&#x5BB9;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x662F;<code>FileReader.readAsArrayBuffer()</code>&#x65B9;&#x6CD5;&#x7684;&#x4F8B;&#x5B50;&#xFF0C;&#x7528;&#x4E8E;&#x8BFB;&#x53D6;&#x4E8C;&#x8FDB;&#x5236;&#x6587;&#x4EF6;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// HTML &#x4EE3;&#x7801;&#x5982;&#x4E0B;</span>
<span class="hljs-comment">// &lt;input type=&quot;file&quot; onchange=&quot;typefile(this.files[0])&quot;&gt;&lt;/input&gt;</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">typefile</span>(<span class="hljs-params">file</span>) </span>{
  <span class="hljs-comment">// &#x6587;&#x4EF6;&#x5F00;&#x5934;&#x7684;&#x56DB;&#x4E2A;&#x5B57;&#x8282;&#xFF0C;&#x751F;&#x6210;&#x4E00;&#x4E2A; Blob &#x5BF9;&#x8C61;</span>
  <span class="hljs-keyword">var</span> slice = file.slice(<span class="hljs-number">0</span>, <span class="hljs-number">4</span>);
  <span class="hljs-keyword">var</span> reader = <span class="hljs-keyword">new</span> FileReader();
  <span class="hljs-comment">// &#x8BFB;&#x53D6;&#x8FD9;&#x56DB;&#x4E2A;&#x5B57;&#x8282;</span>
  reader.readAsArrayBuffer(slice);
  reader.onload = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
    <span class="hljs-keyword">var</span> buffer = reader.result;
    <span class="hljs-comment">// &#x5C06;&#x8FD9;&#x56DB;&#x4E2A;&#x5B57;&#x8282;&#x7684;&#x5185;&#x5BB9;&#xFF0C;&#x89C6;&#x4F5C;&#x4E00;&#x4E2A;32&#x4F4D;&#x6574;&#x6570;</span>
    <span class="hljs-keyword">var</span> view = <span class="hljs-keyword">new</span> <span class="hljs-built_in">DataView</span>(buffer);
    <span class="hljs-keyword">var</span> magic = view.getUint32(<span class="hljs-number">0</span>, <span class="hljs-literal">false</span>);
    <span class="hljs-comment">// &#x6839;&#x636E;&#x6587;&#x4EF6;&#x7684;&#x524D;&#x56DB;&#x4E2A;&#x5B57;&#x8282;&#xFF0C;&#x5224;&#x65AD;&#x5B83;&#x7684;&#x7C7B;&#x578B;</span>
    <span class="hljs-keyword">switch</span>(magic) {
      <span class="hljs-keyword">case</span> <span class="hljs-number">0x89504E47</span>: file.verified_type = <span class="hljs-string">&apos;image/png&apos;</span>; <span class="hljs-keyword">break</span>;
      <span class="hljs-keyword">case</span> <span class="hljs-number">0x47494638</span>: file.verified_type = <span class="hljs-string">&apos;image/gif&apos;</span>; <span class="hljs-keyword">break</span>;
      <span class="hljs-keyword">case</span> <span class="hljs-number">0x25504446</span>: file.verified_type = <span class="hljs-string">&apos;application/pdf&apos;</span>; <span class="hljs-keyword">break</span>;
      <span class="hljs-keyword">case</span> <span class="hljs-number">0x504b0304</span>: file.verified_type = <span class="hljs-string">&apos;application/zip&apos;</span>; <span class="hljs-keyword">break</span>;
    }
    <span class="hljs-built_in">console</span>.log(file.name, file.verified_type);
  };
}
</code></pre>




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